Eagan Company has three product lines, A, B, and C. The following information is available:

	A	B C
Sales	$ 30,000	$ 19,000	$ 10,500
Variable costs	19,000	10,500	7,500
Contribution margin	$ 11,000	$ 8,500	$ 3,000
Fixed costs:
Avoidable	5,000	4,500	1,000
Unavoidable	2,500	6,000	750
Operating income	$ 3,500	$ (2,000)	$ 1,250

Assume that product line B is discontinued and replaced with product line C. This will triple the production and sales of product line C without increasing fixed costs. Operating income will __________.

The answer key says that "increase $2,000" is the correct answer. Can you please thoroughly explain why this is the correct answer? If line B is dropped, will line A and C or just line C be operational? Will the variable costs of line C triple? Will the company still have to pay the unavoidable fixed costs of line B?

Thank you.